Magnetic field induced capacitance enhancement in graphene and magnetic graphene nanocomposites

Zhu, Jiahua; Chen, Minjiao; Qu, Honglin; Luo, Zhiping; Wu, Shijie; Colorado, Henry A.; Wei, Suying; Guo, Zhanhu

doi:10.1039/c2ee23422j

Cited by 148 publications

(97 citation statements)

References 56 publications

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“…Based on their energy storage mechanisms, supercapacitors can generally be classified into two categories: electrical double-layer capacitors (EDLCs) and pseudocapacitors. Carbonaceous materials are often employed in EDLCs to deliver double-layer capacitance through the accumulation of electrostatic charge on the carbon-based electrodes [8,[12][13][14][15][16], while redox-active materials are commonly used in pseudocapacitors to store energy via fast and reversible surface redox reactions [17][18][19][20][21][22]. The growing interest in the latter, which includes conducting polymers and transition metal oxides/hydroxides, is driven by the vastly superior specific capacitance generated by the efficient Faradaic reactions in pseudocapacitors [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

NiCo2O4@TiN Core-shell Electrodes through Conformal Atomic Layer Deposition for All-solid-state Supercapacitors

Wang

Xia

Wei

et al. 2016

Electrochimica Acta

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Graphical abstract Highlights: NiCo2O4 nanostructures are prepared via simple hydrothermal method. Outer shell of TiN is then grown through conformal atomic layer deposition. Electrodes exhibit significantly enhanced rate capability with TiN coating. Solid-state polymer electrolyte is employed to improve cycling stability. Full devices show a stack power density of 58.205 mW cm -3 at 0.061 mWh cm -3 . AbstractTernary transition metal oxides such as NiCo2O4 show great promise as supercapacitor electrode materials. However, the unsatisfactory rate performance of NiCo2O4 may prove to be a major hurdle to its commercial usage. Herein, we report the development of NiCo2O4@TiN core-shell nanostructures for all-solid-state supercapacitors with significantly enhanced rate capability. We demonstrate that a thin layer of TiN conformally grown by atomic layer deposition (ALD) on NiCo2O4 nanofiber arrays plays a key role in improving their electrical conductivity, mechanical stability, and rate performance. Fabricated using the hybrid NiCo2O4@TiN electrodes, the symmetric all-solid-state supercapacitor exhibited an impressive stack power density of 58.205 mW cm -3 at a stack energy density of 0.061 mWh cm -3 . To the best of our knowledge, these values are the highest of any NiCo2O4-based all-solid-state supercapacitor reported. Additionally, the resulting NiCo2O4@TiN all-solid-state device displayed outstanding cycling stability by retaining 70% of its original capacitance after 20,000 cycles at a high current density of 10 mA cm -2 . These results illustrate the promise of ALD-assisted hybrid NiCo2O4@TiN electrodes for sustainable and integrated energy storage applications.

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Section: Introductionmentioning

confidence: 99%

NiCo2O4@TiN Core-shell Electrodes through Conformal Atomic Layer Deposition for All-solid-state Supercapacitors

Wang

Xia

Wei

et al. 2016

Electrochimica Acta

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“…Its excellent electric and mechanical properties have attracted great interest in recent years [2][3][4][5][6] and its applications in polymer nanocomposites [7][8][9][10][11] almost followed the footsteps of carbon nanotubes [12][13][14]. However, graphene is difficult to disperse in polymer matrix because of strong van der Waals attraction between graphene sheets.…”

Section: Introductionmentioning

confidence: 99%

One-pot fabrication of poly(vinyl alcohol)/graphene oxide nanocomposite films and their humidity dependence of mechanical properties

2014

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The exfoliated graphene oxides (GOs) prepared via the Hummer's method were well dispersed in water but re-stacked if drying to a powder form as observed by transmission electron microscope and x-ray diffraction pattern. Hence, they were directly mixed with poly(vinyl alchohol) (PVA) in water to fabricate the PVA/GO nanocomposite films by casting the resulting aqueous solutions and drying. As the nanocomposite films with no less than 5 wt% GO content were subjected to combustion, the char residue could preserve their original film profile acting like an inflammable scaffold. The glassy transition temperature of as-fabricated PVA/GO nanocomposite films barely changed with the content of GO but significantly decreased from~70 to~10°C as environmental relative humidity (RH) was increased from 20 to 80 % due to more moisture adsorption. Therefore, the mechanical behavior of PVA/GO nanocomposite films not only depended on the GO content but also RH, exhibiting from rubbery to glassy status.

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“…Graphene possesses a two-dimensional structure consisting of sp 2 hybridized carbon atoms covalently bonded in a honeycomb or hexagonal lattice with only one atomic thickness [47][48][49][50]. Due to its superior thermal, mechanical, electronic, and chemical properties, graphene and its derivatives can be applied to many fields, such as electronics, energy, sensors, and composites [51][52][53][54].…”

Section: Graphene-based Nanoadsorbentsmentioning

confidence: 99%

Carbon nanotubes, graphene, and their derivatives for heavy metal removal

Guo

et al. 2017

Adv Compos Hybrid Mater

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178

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Carbon nanoadsorbents have attracted tremendous interest for metal ion removal from wastewater due to their extraordinary aspect ratios, surface areas, porosities, and reactivities. However, challenges still exist as they suffer from subpar dispersion and recovery, tending to aggregate, and so on. Thus, significant research efforts focus on modification of these carbon nanomaterials to increase the dispersions and recoveries, while maintaining or even enhancing the desirable properties. This review aims to give an in-depth look at recent and impactful advances in metal ion adsorption applications involving these modified carbon nanostructures. Here, the advanced design and testing of modified carbon nanostructures for metal ion removal are emphasized with comprehensive examples, and various adsorption behaviors and mechanisms are discussed, which are hoped to help the development of more effective adsorbents for water treatment.

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Magnetic field induced capacitance enhancement in graphene and magnetic graphene nanocomposites

Cited by 148 publications

References 56 publications

NiCo2O4@TiN Core-shell Electrodes through Conformal Atomic Layer Deposition for All-solid-state Supercapacitors

NiCo2O4@TiN Core-shell Electrodes through Conformal Atomic Layer Deposition for All-solid-state Supercapacitors

One-pot fabrication of poly(vinyl alcohol)/graphene oxide nanocomposite films and their humidity dependence of mechanical properties

Carbon nanotubes, graphene, and their derivatives for heavy metal removal

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